Java developers can create fast AWS Lambda functions with two main approaches. The Micronaut Framework gives you a full toolkit with fast startup times below one second. The Raw Java approach is even simpler with cold starts under 500 milliseconds. Both methods work with API Gateway and ALB for production use.
Choose Micronaut when you need dependency injection and complex apps. Choose Raw Java for simple handlers with the least overhead. This guide shows you how to set up the project, write handlers, and follow best practices like reusing database connections.
You will also learn how to handle errors and tune memory and timeout settings. The result is a high-performance serverless Java application that starts quickly every time.
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